Last Modified: 11-20-2023 |
6.11:8.1.0 |
Doc ID: RM1000000014YKI |
Model Year Start: 2018 |
Model: Camry HV |
Prod Date Range: [07/2017 -
] |
Title: DOOR LOCK: WIRELESS DOOR LOCK CONTROL SYSTEM: B1242; Wireless Door Lock Tuner Circuit Malfunction; 2018 - 2024 MY Camry HV [07/2017 - ] |
DTC
|
B1242
|
Wireless Door Lock Tuner Circuit Malfunction
|
DESCRIPTION
The electrical key and tire pressure monitoring system receiver assembly is used to receive radio waves related to the entry functions of the electrical key transmitter sub-assembly. The certification ECU (smart key ECU assembly) decodes the requested electrical key transmitter sub-assembly operation by identifying a key code based on the radio waves received via the electrical key and tire pressure monitoring system receiver assembly. The electrical key and tire pressure monitoring system receiver assembly receives a signal from the electrical key transmitter sub-assembly and sends signals to the main body ECU (multiplex network body ECU) through the certification ECU (smart key ECU assembly). (ex. If a door lock operation is requested, the certification ECU (smart key ECU assembly) sends a door lock command to the main body ECU (multiplex network body ECU)).
DTC No.
|
Detection Item
|
DTC Detection Condition
|
Trouble Area
|
B1242
|
Wireless Door Lock Tuner Circuit Malfunction
|
-
Short to ground in RDAM terminal circuit between the certification ECU (smart key ECU assembly) and electrical key and tire pressure monitoring system receiver assembly.
-
Short to ground in RDAM terminal circuit when voltage (5 V) is not being output from terminal RCO
|
-
Wire harness or connector
-
Electrical key and tire pressure monitoring system receiver assembly
-
Certification ECU (smart key ECU assembly)
|
WIRING DIAGRAM
CAUTION / NOTICE / HINT
PROCEDURE
1.
|
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)
|
(a) Disconnect the R9*1, R127*2 electrical key and tire pressure monitoring system receiver assembly connector.
-
*1: Before Sep. 2021 Production
-
*2: From Sep. 2021 Production
(b) Measure the voltage and resistance and check for pulses according to the value(s) in the table below.
*a
|
Component with harness connected
(Certification ECU (Smart Key ECU Assembly))
|
-
|
-
|
Standard Voltage:
Tester Connection
|
Condition
|
Specified Condition
|
R8-19 (RDAM) - K62-18 (E)
|
Always
|
11 to 14 V
|
R8-18 (RCO) - K62-18 (E)
|
Always
|
Below 1 V → 4.5 to 5.5 V pulse generation at regular intervals
|
Standard Resistance:
Tester Connection
|
Condition
|
Specified Condition
|
K62-18 (E) - Body ground
|
Always
|
Below 1 Ω
|
NG
|
|
|
2.
|
CHECK HARNESS AND CONNECTOR (ELECTRICAL KEY AND TIRE PRESSURE MONITORING SYSTEM RECEIVER ASSEMBLY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))
|
(a) Disconnect the R8 certification ECU (smart key ECU assembly) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Before Sep. 2021 Production
Tester Connection
|
Condition
|
Specified Condition
|
R8-19 (RDAM) - R9-2 (DATA)
|
Always
|
Below 1 Ω
|
R8-18 (RCO) - R9-8 (+5)
|
Always
|
Below 1 Ω
|
R9-12 (GND) - Body ground
|
Always
|
Below 1 Ω
|
R9-2 (DATA) or R8-19 (RDAM) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
R9-8 (+5) or R8-18 (RCO) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
From Sep. 2021 Production
Tester Connection
|
Condition
|
Specified Condition
|
R8-19 (RDAM) - R127-2 (DATA)
|
Always
|
Below 1 Ω
|
R8-18 (RCO) - R127-8 (+5)
|
Always
|
Below 1 Ω
|
R127-12 (GND) - Body ground
|
Always
|
Below 1 Ω
|
R127-2 (DATA) or R8-19 (RDAM) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
R127-8 (+5) or R8-18 (RCO) - Other terminals and body ground
|
Always
|
10 kΩ or higher
|
NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR
|
|